Esprocarb
Esprocarb is a thiocarbamate herbicide used preëmergently and post emergently to control annual weeds and grasses, such as on paddy rice. It was introduced in 1988 in Japan
Esprocarb mixes have been tested in Japan starting in 1985 for its effectiveness against cockspur grass, often mixed with the herbicide bensulfuron-methyl. Testing for esprocarb was meant to allow for a longer, residual control of weeds, eliminating the need for follow-up one-shot herbicide applications.
Esprocarb's mode of action makes its HRAC classification Group K3, Group K, Group 15 ; it inhibits very long chain fatty acid synthesis.
It is usually sold as granules and has been marketed as "Fuji-Grass".
Environmental behavior
Esprocarb is toxic to fish; its 96-hour LC50 for fish is 1.52 g/L. It is not toxic to birds or mammals, with an over 2000 mg/kg. It has a GHS 'Toxic' mark, though its low toxicity should exempt it.It is non-mobile in soil and has a soil half-life of 50 days, making it moderately persistent.